A series of fire tests were conducted to characterize the potential hazard from ignition of Scotch Pine Christmas trees. Heat release rate was measured as a function of time from ignition using a large calorimeter. In addition, radiative flux and total heat flux were measured at a location 2 m from the tree centerline. Seven of the trees were allowed to dry for approximately three weeks. These trees burned easily when ignited with an electric match. An eighth tree, freshly cut and kept in water until just before testing, could not be ignited.